我是 Android 开发新手，遇到一些调试问题。我正在从一个名为“TheNewBoston”的 YouTube channel 学习，并且在第 10 课中遇到了问题。我没有使用与教程中的人相同的 src 包，因为我找不到它，所以我想知道这是否造成了这个问题。
添加按钮和子按钮在 OnCreate 方法中都具有相同的“此行有多个标记 - 按钮无法按类型解析”错误。
Java:
package com.example.thenewboston.sam;
import android.annotation.TargetApi;
import android.app.Activity;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.example.thenewboston.sam.util.SystemUiHider;
public class FullscreenActivity extends Activity {
/**
* Whether or not the system UI should be auto-hidden after
* {@link #AUTO_HIDE_DELAY_MILLIS} milliseconds.
*/
int counter;
Button add, sub;
TextView Display;
private static final boolean AUTO_HIDE = true;
/**
* If {@link #AUTO_HIDE} is set, the number of milliseconds to wait after
* user interaction before hiding the system UI.
*/
private static final int AUTO_HIDE_DELAY_MILLIS = 3000;
/**
* If set, will toggle the system UI visibility upon interaction. Otherwise,
* will show the system UI visibility upon interaction.
*/
private static final boolean TOGGLE_ON_CLICK = true;
/**
* The flags to pass to {@link SystemUiHider#getInstance}.
*/
private static final int HIDER_FLAGS = SystemUiHider.FLAG_HIDE_NAVIGATION;
/**
* The instance of the {@link SystemUiHider} for this activity.
*/
private SystemUiHider mSystemUiHider;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fullscreen);
counter = 0;
add = (button) findViewById(R.id.bAdd);
sub = (button) findViewbyId(R.id.bSub);
Display = (TextView) findViewById(R.id.tvDisplay);
add.SetOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
counter++;
Display.setText("your total is " + counter);
}
});
sub.SetOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
counter--;
}
});
final View controlsView = findViewById(R.id.fullscreen_content_controls);
final View contentView = findViewById(R.id.fullscreen_content);
// Set up an instance of SystemUiHider to control the system UI for
// this activity.
mSystemUiHider = SystemUiHider.getInstance(this, contentView,
HIDER_FLAGS);
mSystemUiHider.setup();
mSystemUiHider
.setOnVisibilityChangeListener(new SystemUiHider.OnVisibilityChangeListener() {
// Cached values.
int mControlsHeight;
int mShortAnimTime;
XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<!--
The primary full-screen view. This can be replaced with whatever view
is needed to present your content, e.g. VideoView, SurfaceView,
TextureView, etc.
-->
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Your total is 0"
android:textSize="45sp"
android:textStyle="bold"
android:layout_gravity="center"
android:gravity="center"
android:id="@+id/tvDisplay"
/>
<Button
android:layout_width="250sp"
android:layout_height="wrap_content"
android:text="Add one"
android:layout_gravity="center"
android:textSize="20sp"
android:id="@+id/bAdd"
></Button>
<Button
android:layout_width="250sp"
android:layout_height="wrap_content"
android:text="Subtract one"
android:layout_gravity="center"
android:textSize="20sp"
android:id="@+id/bSub"
></Button>
</LinearLayout>
<!--
This FrameLayout insets its children based on system windows using
android:fitsSystemWindows.
-->
最佳答案
add.SetOnClickListener
SetOnClickListener 的 s 必须小写。
还有 Actor :
(button)
是错误的，如评论框中所述。它应该是按钮
关于java - 按钮无法解析为类型 - Android 开发，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22041989/